Need Help making a frosted light Bulb material
Overview:



I'll show you two methods with their pros and cons. One of them are using Cynicat Pro PBR Nodes and the second one is created by myself. As pointed by @cegeton you'll need some kind of environment to see reflections in light bulb. Try HDRI maps.

Both setups are using same masking method so I'll start with that.

Mask:

Mask is for the transition between clear glass and frosted/milky one.



You can control position of this transition and sharpness/smoothness.

My method:

My setup is using simple mix of Translucent and Glossy shader by Layer Weight.

If you want to have less/more reflection you can tweak Layer Weight Blend value.

Pros: It's good if you want to have it completely off (no light emission) and also works with light source inside.

Cons: It's pretty "heavy" to render, note amount of noise in final render.



Method based on Cynicat Pro PBR:

After downloading file from link in overview, append from it two Materials - Light and Glass. Then set Light as your object material and modify it accordingly to the image. PBR nodes are in Add > Group in Node Editor.

Pros: It look awesome. It's really fast. It's easy to manipulate.

Cons: It need to be always turned on. Emission value should be higher then something around 0.2, otherwise material is black.